w1 = [0.1*pi 0.4*pi 0.8*pi pi 2*pi];
A = [6.1427 0.60 0.16 0.1004 0.04];
Phai = [-126 -161.50 -169.34 -171 -183.60];
subplot(2,1,1)
plot(w1,A,'r-');
subplot(2,1,2)
plot(w1,Phai,'b-');